Oracle 23ai (also known as Oracle 23c with AI features) introduces several powerful enhancements aimed at improving observability, diagnostics, and performance debugging. Among these enhancements are three new dynamic performance views designed specifically to help DBAs and developers troubleshoot Data Pump performance issues more efficiently and in real-time.
When dealing with large data exports or imports using Oracle Data Pump, performance bottlenecks or unexplained hangs can be frustrating and time-consuming to investigate. Until now, DBAs had to rely heavily on Data Pump log files, trace files, and session-level v$ views to diagnose problems. With the introduction of the following views, Oracle has taken a major step toward simplifying that process:
The three new views are: GV$DATAPUMP_PROCESS_INFO, GV$DATAPUMP_PROCESSWAIT_INFO and GV$DATAPUMP_SESSIONWAIT_INFO
These views provide real-time information about the state of Data Pump processes, their wait events, and any session-level contentions. GV$ views return cluster-wide information in a RAC environment, while V$ views return information specific to the current instance.
- GV$DATAPUMP_PROCESS_INFO – This view shows the current Data Pump processes, including both master and worker processes. It provides basic information like the program name, session ID, username, job name, status, and system process ID.
SELECT * FROM V$DATAPUMP_PROCESS_INFO;
CUR_DATE PROGRAM SESSIONID STATUS USERNAME JOBNAME SPID
2023-01-09 13:56:07 ude@orcl (TNS V1-V3) 42 ACTIVE SYSTEM SYS_EXPORT_FULL_01 3891480
2023-01-09 13:56:07 oracle@orcl (DW00) 48 ACTIVE SYSTEM SYS_EXPORT_FULL_01 3891500
- GV$DATAPUMP_PROCESSWAIT_INFO – This view helps detect contention between Data Pump processes. It shows which sessions are waiting, what events they are waiting for, and which other sessions may be blocking them.
SELECT * FROM GV$DATAPUMP_PROCESSWAIT_INFO;
WAITING_SESSION HOLDING_SESSION EVENT PROGRAM_WAITSESSION PROGRAM_HOLDINGDSESSION
174 57 enq: TM - contention oracle@orcl (DM00) oracle@orcl (DW00)
- GV$DATAPUMP_SESSIONWAIT_INFO – Provides deep insights into session-level waits during Data Pump operations, including how long the session has been in the wait state and what it’s waiting on.
SELECT * FROM GV$DATAPUMP_SESSIONWAIT_INFO;
WAITING_SESSION EVENT DP_SECONDS_IN_WAIT DP_STATE_IN_WAIT DP_P1TEXT DP_P1
46 enq: TM - contention 8086 WAITING name mode
Before Oracle 23ai, debugging Data Pump jobs required checking logs, trace files, and manual session analysis. These new views provide real-time visibility into what each Data Pump process is doing, what it is waiting on, and where it might be blocked.
Use Cases:
- If a Data Pump job appears hung, GV$DATAPUMP_PROCESSWAIT_INFO can help identify which process is waiting and what it is waiting on.
- If sessions are slow or idle, GV$DATAPUMP_SESSIONWAIT_INFO provides detailed timing and wait reasons.
- If parallel execution is used, GV$DATAPUMP_PROCESS_INFO shows how many worker processes are active and whether they are all functioning as expected.
The new Data Pump views in Oracle 23ai are a significant step forward for real-time performance diagnostics. These views provide valuable insights that were previously hard to obtain, allowing DBAs to troubleshoot and optimize Data Pump operations with much more confidence and clarity.
Hope It Helped!
Prashant Dixit
Tales From A Lazy Fat DBA 